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Discussion Starter #1 (Edited)
I decided to take the radiator oil cooler out of the circuit and just use the big oil cooler that's used for the towing package. At least one CF member had coolant contaminate his transmission fluid. I don't want to take that chance so I modified mine.

Parts that I used.


I was going to use these clamps with the vacuum caps but decided to use the factory ones for now.


Remove the front air spoiler and skid plate. You will need to clamp the inlet hose to prevent the transmission fluid from draining out. That's the long hose leading to the trans oil cooler on the driver's side.




Route the long hose to the right to connect it to the short hose. I used a PVC pipe cutter and cut both hoses at the same time once I decided where to cut. Take your time and make sure you don't kink the hoses before cutting them. If you cut them too short, you will have to buy new hoses and start over.
Insert the tube joint and clamp the hoses onto the joint.


Vacuum caps covering trans oil cooler hose barbs.


I use two 5/16" vacuum caps to cover the hose barbs on the trans oil cooler. I used the old factory clamps since it doesn't have to be really tight. It's just to keep it clean. You could opt for standard hose clamps or some like shown in the 2nd photo above. Pour any drained fluid back into the transmission if you drained it into a clean container. Start the engine and check for leaks.
 

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Nice write up. Its really not very hard is it?

The only downside to this, and why when I put my tranmission cooler in- i put it in line with my radiator cooler on my pathfinder, is the radiator does not warm the tranny fluid. So you might get some harder shifts in the morning in the winter..
 

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Discussion Starter #3
Nice write up. Its really not very hard is it?

The only downside to this, and why when I put my tranmission cooler in- i put it in line with my radiator cooler on my pathfinder, is the radiator does not warm the tranny fluid. So you might get some harder shifts in the morning in the winter..
Thanks. It's not hard at all. Florida winters are not that brutal. I'll see how it goes.
 

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I really like the caps, most people just leave that stuff open.
 

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Living in Florida, did you really want to do this? I have the Nismo, no tow package and I have the dual coolers, like you do. I thought all V-6s came like that.
 

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Discussion Starter #7 (Edited)
who on here had coolant in there trans fluid? i must have missed that.
http://www.clubfrontier.org/forums/f8/transmission-radiator-failure-34877/

Living in Florida, did you really want to do this? I have the Nismo, no tow package and I have the dual coolers, like you do. I thought all V-6s came like that.
What harm can it do? The big oil cooler is on all of the autos from the factory as you stated. One of the big selling points for the 05-up Frontier is the towing capacity. I'm sure that's why they added the additional cooler.
 

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I spoke to the master service tech (30+ years experience) at my dealership about this issue regarding my '06 LE KC. He recommended I close this bypass and add a trans cooler after my 3yr/36000 mi warranty expired. So, this must be an issue with these trucks.
 

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I spoke to the master service tech (30+ years experience) at my dealership about this issue regarding my '06 LE KC. He recommended I close this bypass and add a trans cooler after my 3yr/36000 mi warranty expired. So, this must be an issue with these trucks.
Add another one in addition to the factory cooler?
 

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Well I may have misunderstood him. But he did mention purchasing a quality external trans cooler. Anyway, he did recommend the bypass to eliminate contamination of trans fluid.
 

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SO I guess I miss the reasoning behind this mod too? only because of a possible contamination? I don't think I want to bypass any of my cooling. I want max cooling on everything.
 

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SO I guess I miss the reasoning behind this mod too? only because of a possible contamination? I don't think I want to bypass any of my cooling. I want max cooling on everything.
It's to avoid the possibility of coolant entering the transmission fluid and ruining your high dollar transmission. The trans oil cooler doesn't hold much fluid to begin with. While you're driving, the pump pushes the fluid through that little cooler so fast I doubt if it will make any significant difference.

If it were not for the larger cooler in front of the condenser, the radiator cooler would be almost useless in the current size. The front oil cooler can cool better than the engine coolant can because it's right in the air stream whether you're moving or not. :noworries:
 

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What harm can it do? .
The hellish Florida heat?!

I just don't see Nissan going through the expense of putting it there for no reason.

Oh, I just though of something. We have an AT temp warning light so I suppose you could monitor that for potential heat issues.
 

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The hellish Florida heat?!

I just don't see Nissan going through the expense of putting it there for no reason.

Oh, I just though of something. We have an AT temp warning light so I suppose you could monitor that for potential heat issues.

As I stated earlier, the radiator oil cooler doesn't hold much fluid. The very large auxiliary oil cooler can handle the Florida heat much better than the tiny oil cooler I took out of the circuit. Besides that, the cooling fan for the condenser is behind the aux cooler. If you use your AC like I do in the hot summer months, there should not be any excessive heat issues in the transmission. I don't expect any negative issues from this slight modification.
 

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Zero Six LE, Thanks much for the write up and the pictures. I am planning on doing this mod whenever I get a chance. You mentioned that the inlet hose needed to be clamped to prevent the fluid from draining out. Did you use those vice grips to clamp the hose? If not, please let us know what you did use.

Regards.
 

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Discussion Starter #18
Zero Six LE, Thanks much for the write up and the pictures. I am planning on doing this mod whenever I get a chance. You mentioned that the inlet hose needed to be clamped to prevent the fluid from draining out. Did you use those vice grips to clamp the hose? If not, please let us know what you did use.

Regards.
You're welcome. Yes, I used a small pair of Vise grips to clamp the hose. Just don't clamp down on it too much where it will be damaged.
 

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Thanks Zero Six LE!

I ordered the part tonight and will be doing this mod during my next oil change. Our 2k5 only has 23k miles on it so far, but I will be driving the truck for at least the next decade or so.

Thank you for the great write up and part number. You are definitely correct that the towing package cooler is MUCH larger than the transmission based one so unless you live where the temp gets up above 120 and you tow non-stop this mod is much better than a new transmission any day of the week.

On your write up can you state the amount of time that it took? Guesstimate. :)

Thanks again!
 

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Discussion Starter #20 (Edited)
Thanks Zero Six LE!

I ordered the part tonight and will be doing this mod during my next oil change. Our 2k5 only has 23k miles on it so far, but I will be driving the truck for at least the next decade or so.

Thank you for the great write up and part number. You are definitely correct that the towing package cooler is MUCH larger than the transmission based one so unless you live where the temp gets up above 120 and you tow non-stop this mod is much better than a new transmission any day of the week.

On your write up can you state the amount of time that it took? Guesstimate. :)

Thanks again!
You're welcome and thank you. It can be done in way under an hour if you don't have to take pictures while doing it. I removed 14¾" from the long hose and 4¼" from the short hose from the radiator cooler ends.

SO I guess I miss the reasoning behind this mod too? only because of a possible contamination? I don't think I want to bypass any of my cooling. I want max cooling on everything.
I removed a trans oil cooler from a Dodge Ram 2500 radiator. It's from a cross flow radiator and ours is a down flow radiator. The same cooling principles apply though. The engine coolant helps dissipate the heat from the hot ATF after the coolant has been cooled in the radiator.

Our radiator cooler is probably a little smaller than this one but I'm not sure. There is not much room inside the tubes for ATF on this cooler or the one in our Frontiers. The Dodge did not have an auxiliary oil cooler and it's a full size 4X4.

In theory, the ATF is the hottest as it leaves the transmission. I took temperature readings from the front mounted cooler last week. In naturally runs cooler when the ambient temperature is low. The lowest reading I took after driving 24 miles to work was on a foggy morning and it was 54°F. The hottest reading on the cooler was 99°. The hottest reading so far was on my trip home from work was 164° where the outside temp was 75°F.

The pan temperature was much lower than the cooler temp so it's doing the job it should do. The main thing to worry about is when you're towing a heavy load in hot temperatures or climbing hills. I don't plan on doing either of those things.





 
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